package com.ruihu.admin.config;

import com.ruihu.admin.util.RhThreadUtil;
import org.apache.commons.lang3.concurrent.BasicThreadFactory;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;

import java.util.concurrent.*;

@Configuration
public class ThreadPoolConfig {
    // 核心线程池大小
    @Value("${thread.pool.core.size}")
    private int corePoolSize;

    // 最大可创建的线程数
    @Value("${thread.pool.max.size}")
    private int maxPoolSize = 200;

    // 队列最大长度
    @Value("${thread.pool.queue.size}")
    private int queueCapacity = 1000;

    // 线程池维护线程所允许的空闲时间
    @Value("${thread.pool.keep.alive}")
    private int keepAliveSeconds = 300;

    @Bean(name = "threadPoolTaskExecutor")
    public ThreadPoolTaskExecutor threadPoolTaskExecutor() {
        ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
        executor.setMaxPoolSize(maxPoolSize);
        executor.setCorePoolSize(corePoolSize);
        executor.setQueueCapacity(queueCapacity);
        executor.setKeepAliveSeconds(keepAliveSeconds);
        executor.setThreadNamePrefix("rh-thread-pool");
        // 线程池对拒绝任务(无线程可用)的处理策略
        executor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());
        return executor;
    }

    /**
     * 执行周期性或定时任务
     */
    @Bean(name = "scheduledExecutorService")
    protected ScheduledExecutorService scheduledExecutorService() {
        return new ScheduledThreadPoolExecutor(corePoolSize,
                new BasicThreadFactory.Builder().namingPattern("rh-schedule-pool-%d").daemon(true).build()) {
            @Override
            protected void afterExecute(Runnable r, Throwable t) {
                super.afterExecute(r, t);
                RhThreadUtil.printException(r, t);
            }
        };
    }

    /**
     * 执行周期性或定时任务
     */
    @Bean(name = "poolExecutorService4IO")
    protected ThreadPoolExecutor poolExecutorService() {
        ThreadPoolExecutor threadPoolExecutor = new ThreadPoolExecutor(
                this.corePoolSize,
                Runtime.getRuntime().availableProcessors() * 2 + 1,
                60L,
                TimeUnit.SECONDS,
                new ArrayBlockingQueue<>(this.queueCapacity)
        );
        threadPoolExecutor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());
        return threadPoolExecutor;
    }
}
